/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.samza.metrics;

import org.apache.samza.config.Config;


/**
 * A MetricsValidator reads the job's metrics values by using the {@link org.apache.samza.metrics.MetricsAccessor},
 * and validate them.
 */
public interface MetricsValidator {
  /**
   * Initialize with config.
   * @param config Job config
   */
  void init(Config config);

  /**
   * Validate the metrics values of a job
   * @param accessor Accessor to get the metrics values through specific metrics system, e.g. JMX.
   * @throws MetricsValidationFailureException Exception when the validation fails.
   */
  void validate(MetricsAccessor accessor) throws MetricsValidationFailureException;

  /**
   * Complete validation. Final checks can be performed here.
   * @throws MetricsValidationFailureException Exception when the validation fails.
   */
  void complete() throws MetricsValidationFailureException;
}